Lights....lights....lights?

My van is being persnickety. This weekend I stomped into the house and declared to mom that if my van had a neck, I'd be wringing it. The electrical system is something else!

I dug out all of the wires from behind the walls and tried to make sense of it. I spliced together 4 loose ends and got the back lights to work again. All I needed to do was to get the left blinker to blink. So far I've failed at that task, and am back at square one. None of the back end lights work.
Perhaps I should let a professional deal with it :-)

The auto electrical shop I went to the other day had a sign:

$32 an hour
$36 if you watch
$40 if you help

I need a sign like that for my carpentry business...